package lab02.Test_19;

public class Test_19 {

        public static void main(String[] args) {
            String str = "HelloWorld";
            char []s = str.toCharArray();
            StringBuffer buffer = new StringBuffer();
            for(int i = str.length() - 1;i >= 0;i--) {
                if('A'<=s[i]&&s[i]<='Z')
                    buffer.append(String.valueOf(s[i]).toLowerCase());
                else
                    buffer.append(String.valueOf(s[i]).toUpperCase());

            }
            System.out.println(buffer.toString());
        }}



